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Related Party Transactions (Contractual Joint Venture) (Narrative) (Details) - Joint Venture [Member] - Pacer [Member]
CAD in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
CAD
Dec. 31, 2016
CAD
Related Party Transaction [Line Items]          
Joint venture, ownership percentage 35.00%     35.00%  
Construction projects, percentage complete 90.00%     90.00%  
Performance Guarantees [Member]          
Related Party Transaction [Line Items]          
Guarantees issued, related party | CAD       CAD 132.1 CAD 132.1
Canadian Dollars [Member]          
Related Party Transaction [Line Items]          
Revenue, related party $ 1,500,000 $ 1,000,000 $ 2,100,000    
Canadian Dollars [Member] | Financial Support [Member]          
Related Party Transaction [Line Items]          
Financing or amounts advanced, related party 7,200,000 6,800,000      
Amounts committed, related party 0        
Canadian Dollars [Member] | Performance Guarantees [Member]          
Related Party Transaction [Line Items]          
Guarantees issued, related party 105,100,000 98,300,000      
Canadian Dollars [Member] | Accounts Receivable, Net of Billings in Excess of Costs [Member]          
Related Party Transaction [Line Items]          
Receivables, related party $ 800,000 $ 700,000